Diatoms of North AmericaDiatoms of North America
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Guide to Gomphonema stonei

E.Reichardt 1999

Gomphonema stonei guide
  1. Striae encircle headpole
  2. Headpole broad
  3. Central area rectangular
  4. Stigmoid present

Valve outline is lanceolate, except smaller valves are more clavate. The headpole is broad and encircled by striae. The central area is rectangular. A stigmoid is present on one side of the central area, positioned in line with a stria.